The DCE patch for PR rtl-optimization/42575 appears to have introduced a bootstrap failure on PowerPC targets:
/farm/dje/src/src/gcc/cfg.c: In function 'scale_bbs_frequencies_gcov_type': /farm/dje/src/src/gcc/cfg.c:1109:1: internal compiler error: in delete_corresponding_reg_eq_notes, at dce.c:495 -- Summary: DCE ICE on PPC Product: gcc Version: 4.5.0 Status: UNCONFIRMED Keywords: ice-on-valid-code, build Severity: normal Priority: P3 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: dje at gcc dot gnu dot org GCC build triplet: *-*-* GCC host triplet: *-*-* GCC target triplet: powerpc-*-* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45135